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Патент USA US3075343

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Jan.‘ 29, 1963
A. E. REVELL
3,075,333
DUST SEPARATOR APPARATUS
Filed Aug. 11, 1960
INVENTOR.
ALAN E. REVELL
@4494 5M
ATTORNEY
United States Patent O?ice
3,075,333
l’atented Jan. 29, 1963
2
1
be less than 30° in order to minimize shock loss and
3,il75,333
DUST SEPARATOR APPARATUS
Alan E. Revel], Jeffersontown, Ky., assignor to American
Air Filter Company, Inc., Louisville, Ky., a corpora
,tion of Delaware
'
to avoid excessive pressure drop during gas treating oper
ations.
Each media support member 8 includes an upstream
face 14 which is in the form of a foraminous screen so
as to permit free ?ow of gas therethrough, the vertically
extending sides of the upstream face being provided with
media guide members 16. Fastened to and extending
vertically between the right angle structural members 6
The present invention relates to dust ?lter apparatus,
and more particularly to dust ?lter apparatus of the type 10 and 7, intermediate the downstream portion of the side
?anks 9, 11 of support members 8, so as toroffset from
employing a moving endless belt of ?lter medium which
Filed Augc 11, 1960, Ser. No. 48,866
19 Claims. (Cl. 55—233)
screens 14 along the line of gas ?ow are downstream
foraminous screens 18. It is to be noted that not only
are screens 18 offset from screens 14 along the line of gas
area to a gas stream to be treated, the ?ltering area pre 15 flow of the gas ?ow stream to be treated, but, in addition,
the screens 14 and 18 have overlapping side portions
sented requiring a minimum of space and offering a mini
transverse such line of ?ow.
mum of resistance to the treated stream. in addition, the
Rotatably mounted between the side walls of housing
present invention provides a ?lter apparatus which aifords
moves across the path of a gas flow stream to be treated.
In accordance with the present invention, ‘a dust ?lter
is provided which presents a maximum of clean ?ltering
a readily renewable ?lter medium, the apparatus being
straight-forward, economical and ef?cient in its construc
tion and in its operation.
Various other features of the present invention will be
come obvious to one skilled in the art upon reading the
disclosure set forth hereinafter.
More particularly, the present invention provides a
gas cleaner apparatus comprising a plurality of endless‘
?lter belts arranged to move in endless paths across a
gas ?ow stream to be treated so that successive portions
of each of the ?lter belts enter the gas ?ow stream at an
entrance point, pass across it, then leave it an an exit
2 immediately above and below right angle structural
members 6 and 7 are horizontally extending roll pairs 21,
22 and 23, 24 respectively; the rolls of each pair being
closely spaced to permit snug passage and compression
therebetween of the hereinafter described endless ?lter
belts of ?lter belt sets 26, 27.
In the advantageous em
bodiment of the apparatus disclosed, the large roll 23 of
the lower roll pair 23, 24 extends through one side of
housing 2. A pinion gear 29 ?xedly mounted on the‘
extended portion of roll 23 meshes with gear 30 mounted
on shaft 31 of a suitable drive motor 32.
It is to be
noted that the rolls of roll pair 23, 24 are spaced su?‘i
point, the ?lter belts positioned with respect to eachv
other to present a pleat type construction upstream of the
gas ?ow stream, and means for moving the ?lter belts into
ciently close together to permit friction drive of the end-'
less ?lter media belts of the belt sets 26, 27 passing
therethrough and, at the same time, to compress such
and out of the gas flow stream.
It is to be understood that various changes can be
made in the arrangement, form and construction of the
apparatus disclosed herein without departing from th
'
scope or spirit of the present invention.
Referring to‘ the drawing which discloses one -advan-~
40
tageous embodiment of the present invention:
‘FIGURE 1 is an elevational sectional view of a'du'st'.
separator apparatus embodying the present invention; '
?lter belts. It also is to be noted that roll 23 can be hol
low and that the wall portion thereof can be provided
with a plurality of spaced longitudinally disposed aper
tures 33. With such an arrangement, washing liquid’
can be passed through hollow roll 23 and apertures 33
onto the ?lter media belt of belt sets 26, 27 through a
swivel connection with a suitable source of liquid supply'
(not shown), the bottom 28 of housing 2 being sloped
downwardly to permit gravity drainage of such liquid
from the belt into drain 25. Finally, it is to be noted
FIGURE 2 isv a" sectional plan view taken in planev
that roll 21 of the upper roll pair 21, 22 also can be
passing through line 2-2 of FIGURE 1, a portion of
the structure of FIGURE, 1 being omitted for purposes 45 hollow and apertured for feeding ?lter treating liquid to
the belts and that, if desired, the roll pair 21, 22 also can”
of» clarity; and,
serve as a ?lter media drive and compression means.
FIGURE 3 is an enlarged‘ perspective view of a por
The endless ?lter media belt sets 26,- 27 which pass2
tion of the apparatus of FIGURES l and 2: in partially
between roll pairs 21, 22 and 23, 24, advantageously can'
cutaway form.
be of compressible, polyurethane‘ material; however, it is’
Referring to FIGURES l and 2 of the drawing, there
to be understood that‘ the present invention is not limited
is disclosed a substantially rectangular, vertically extend
ing housing 2 having upstream- gas inlet 3 and down‘
to such polyurethane‘. material and that any one of a
number of other well known ?lter media materials can
stream gas outlet 4.- Extending, transverse across-the up
be employed. The upstream ?ights of the endless'belts of ‘
per and lower portions. of housing’ 2 in spaced relation-v
ship from the roof and bottom wall respectfully thereof
set. 27 are arranged to pass over the upstream‘ foraminous
are spaced right; angle structural members 6 andv 7’. The
screens 14 of media support members 8, the belts being‘
extremities. of structural members 6 and 7 are fastened
maintained in proper alignment during movement along
(in a manner not shown.) by some suitable’ means, such
screens 14 by guide members 16; In this connection, it
as. welding or riveting, to» the side Walls ofv housing 2.
is to be [noted that housing 25 has pivotally mounted be- I
Fastened to and extending vertically between structural 60 tween its side walls, upper and lower horizontally ex-_
members 6 and 7 are spaced pleat forming- ?lter. media
tending guide members 328, 39. These guide members,
supPQrt. members, broadly designated by- reference nu
which are shaped to include a plurality of parallel sad
merals 8. Eachpleat forming media. support. member in
dles, serve to maintain the downstream ?ights of endless eludes gas i'mpervious, opposed side. ?anks. 9 and11 and.
gas impervious, opposed top andv bottom ?anks 12 and’ 65 bcltsof set 21"! in proper position; it also is to be noted
13, respectively, It is tobe noted that side ?anks 9 and' ,
11 of each support member 8 fall in planes which con‘.
verge- downstream of housing 2 toward‘ each other so
that the pleated support‘ members 8 have horizontal cross
that guide members 38, 39 are spring loaded by suitable ~
springs 41? connected between the free ends of the guide
.members and the side walls of housing 2 so that the belts‘
of set 27 are maintained in taut position between the ,
sections of truncated shape. Advantageously, the’ angle 70 roller pairs and in sealing engagement against guides 16
to prevent any gas stream leakage or bypass around th
formed between the planes of‘ the converging ?anks.
should‘be approximately 45°’ and, at‘ any rate, shouldn'ot ‘belt sides; the belts of both sets 26 and 27 being of pre
3,075,388
3
selected length to further insure sealing engagement with
their respective guides.
To further prevent a gas stream that is being treated
from bypassing the ?lter belts of sets 26, 27, suitable seal
4
sent a pleat type construction along said upstream ?ight
paths, means for moving said ?lter belts into and out of
such gas ?ow stream, liquid treating means for said ?lter
belts, and compression means cooperable with said belts
ing members are provided to cooperate with the roll
to remove a portion of the liquid with which said belts
pairs. These sealing members include strips 42 mounted
have been treated.
4. The apparatus of claim 3, said ?lter belt moving
and held in place between retainer bar 43 and support
means including at least one pair of closely spaced feed
6, the strip 42 being of some suitable material such as
rolls which serve as a compression means for remov
rubber to ?exibly engage against roll 21, A similar strip
44 is similarly mounted on support 7, strip 44 ?exibly en 10 ing a portion of the liquid.
5. The apparatus of claim 4, one of said feed rolls
gaging against roll 23. In like fashion, horizontally ex
being hollow and having a plurality of spaced longitudi
tending strips 46 and 47 are provided, strip 46 being
nally disposed apertures, one end of said hollow feed
mounted on the roof of housing 2 to ?exibly engage
roll being connected to a suitable source of treating liquid.
against roll 22 and strip 47 being mounted to the bottom
6. Gas cleaner apparatus comprising a plurality of
of housing 2 to ?exibly engage against roll 24.
15
endless ?lter belts arranged to move in spaced upstream
In a typical operation of the apparatus described, mo
and downstream ?ight paths across a gas ?ow stream so
tor 32 is started to drive roll pair 23, 24 through the
that successive portions of each of said ?lter belts enter
pinion gear 29, 30 arrangement aforedescribed, the roll
said gas ?ow stream at an entrance point, pass across it
23 moving in a counterclockwise direction (FIGURE 1)
so that the front ?ights of belt sets 26, 27 move down 20 and then leave it at an exit point, spaced foraminous sup
port members positioned with respect to each other to
wardly over foraminous screens 16, 14- respectively. As
present a pleat type construction along said upstream
the belts are moved along, the guides 16 and 38, 39
?ight paths, and means for moving said ?lter belts over
insure that the belts of set 27 follow their proper course.
said foraminous support members into and out of such
In like manner, the side ?anks of support members 8 in
sure that the belts of set 26 follow their proper course.
When the belts of sets 26 and 27 pass through roll pair
23, 24, a suitable supply of washing liquid can be sup
plied thereto through hollow roll 23 and apertures 33,
the belts being compressed so that a portion of the liquid
is caused to drain o? through drain 25. If desired, a 30
gas ?ow stream.
7. Gas cleaner apparatus comprising a housing having
an upstream gas inlet and a downstream gas outlet de
?ning a path for a gas ?ow stream to be treated, a plu
rality of endless ?lter belts disposed within said housing
between said gas inlet and gas outlet means, said ?lter
suitable ?lter treating liquid can be supplied to the belts
belts being arranged to move in spaced upstream and
through roll 21 and its apertures in order to enhance ?l
downstream ?ight paths across the gas flow stream so that
tering operations as the front ?ights of the belts enter
successive portions of each of said ?lter belts enter said
into the gas stream, the successive portions of each of
gas flow stream at an entrance point, pass across it and
the ?lter belts entering into the gas ?ow stream at ‘an 35 then leave it at an exit point, said ?lter belts being posi
entrance point below the upper roll pair, pass across the
tioned with respect to each other to present a pleat type
gas ?ow stream and then leave it at an exit point above
construction along said upstream ?ight paths, and means
the lower roll pair.
for moving said ?lter belts into and out of such gas ?ow
With the arrangement abovedescribed, a dust ?lter ap
stream.
paratus is provided which continually presents a maxi
8. Gas cleaner apparatus comprising a housing having
mum of fresh ?ltering area to a gas stream to be treated
and yet requires a minimum of space and olfers a mini
mum of resistance to the treated gas stream. In addition,
the arrangement a?ords a readily renewable ?lter medi
um in an apparatus which is straightforward, economical
and efficient in its construction and operation.
The invention claimed is:
1. Gas cleaner apparatus comprising a plurality of
endless ?lter belts arranged to move in spaced upstream
an upstream gas inlet and a downstream gas outlet de
?ning a path for a gas ?ow stream to be treated, a plu
rality of endless ?lter belts disposed within said housing
between said gas inlet and said gas outlet, said ?lter belts
extending transverse said gas ?ow stream and being ar
ranged to move in spaced upstream and downstream ?ight
paths thereacross so that successive portions of each of
said ?lter belts enter said gas ?ow stream at an entrance
point, pass across it and then leave it at an exit point, suc
and downstream ?ight paths across a gas ?ow stream so
cessive ?lter belts being offset with respect to one another
that successive portions of each of said ?lter belts enter 50 along the line of ?ow of the gas flow stream and having
said gas ?ow stream at an entrance point, pass across it
overlapping side portions transverse such line of ?ow to
and then leave it at an exit point, said ?lter belts being
present a pleat type construction along said upstream
positioned with respect to each other to present a pleat
?ight paths, and means for moving said ?lter belts into and
type construction along said upstream ?ight paths, and
out of such gas ?ow stream.
means for moving said ?lter belts into and out of such 55
9. The apparatus of claim 8, and sealing means coop
gas ?ow stream.
erating with said housing to prevent the bypass of gas
2. Gas cleaner apparatus comprising a plurality of
endless ?lter belts arranged to move in spaced upstream
around said belts.
10. Gas cleaner apparatus comprising a housing having
and downstream ?ight paths across a gas ?ow stream so
an upstream gas inlet and a downstream gas outlet de-,
that successive portions of each of said ?lter belts enter 60 ?ning a path for a gas ?ow stream to be treated, a plu
said gas ?ow stream at an entrance point, pass across it
rality of endless ?lter belts disposed within said housing
and then leave it at an exit point, successive ?lter belts
between said gas inlet and said gas outlet, said ?lter belts
being offset with respect to one another along the line of
extending transverse said gas ?ow stream and being ar
?ow of the gas ?ow stream and having overlapping side
ranged to move in spaced upstream and downstream ?ight
65
portions transverse such line of ?ow to present a pleat
paths thereacross so that successive portions of each of
type construction along said upstream ?ight paths, and
said ?lter belts enter said gas ?ow stream at an entrance
means for moving said ?lter belts into and out of such
point, pass across it and then leave it at an exit point,
gas ?ow stream.
3. Gas cleaning apparatus comprising a plurality of
spaced foraminous support members extending adjacent
said upstream ?ight paths of said endless belts, said end
less belts being positioned with respect to each other in
said housing to present a pleat type construction along said
upstream ?ight paths, and means for moving said ?lter
belts over said foraminous support members into and out,
belts being positioned with respect to each other to pre 75 of such gas ?ow stream.
compressible endless ?lter belts arranged to move in
spaced upstream and downstream ?ight paths across a
gas ?ow stream so that successive portions of each of said
?lter belts enter said gas ?ow stream at an entrance point,
pass across it and then leave it at an exit point, said ?lter
3,075,333
6
5
11. The apparatus of claim 10, said foraminous sup
port members having gas impervious side ?anks extending
downstream therefrom, the opposed side ?anks of each
pleat converging toward each other at an angle of not less
than 30° to minimize shock loss and to avoid excessive
belts, said foraminous faces of said upstream support
members having spaced guide rail members extending
along the sides thereof and having side ?anks extending
downstream therefrom, the opposed side ?anks of each
5 upstream support member resting in planes converging
downstream toward each other at an angle of not less
than 30° to minimize shock loss and avoid excessive pres
sure drop, means for moving said ?lter belts into and out
converging toward each other at an angle of approximate
of the gas ?ow stream, liquid treating means for said ?lter
1 45°.
y13. Gas cleaner apparatus comprising a plurality of 10 belts, and sealing means cooperating with said housing to
prevent bypass of said gas around said belts.
endless ?lter belts arranged to move in spaced upstream
17. The apparatus of claim 16, said ?lter belt moving
and downstream ?ight paths across a gas ?ow stream so
means including spaced roll pairs, the rolls of each pair
that successive portions of each of said ?lter belts enter
being closely spaced with at least one pair of said roll
said gas ?ow stream at an entrance point, pass across it
and then leave it at an exit point, said ?lter belts being 15 pairs serving as belt feeding means and compression
means, one of said feed rolls being hollow with the wall
positioned with respect to each other to present a pleat
pressure drop.
12. The apparatus of claim 11, the opposed side ?anks
thereof having a plurality of spaced longitudinally dis
posed apertures, said hollow feed roll being connected to
type construction along said upstream ?ight paths, guide
means for said ?lter belts to insure their movement along
a suitable source of treating liquid.
a predetermined path into and out of such gas ?ow stream,
18. Gas cleaner apparatus comprising a ?rst set of
and means for moving said ?lter belts along such pre 20
?lter media support members arranged in parallel spaced
determined path.
relationship, each of said ?rst set of support members in
cluding an upstream gas pervious foraminous face and
14. The apparatus of claim 13, said guide means in
cluding a spring loaded member acting against said ?lter
gas impervious pleat forming top, bottom and side ?anks,
belts to maintain said belts in taut sealing position.
15. Gas cleaner apparatus'comprising a housing having 25 a second set of ?lter media support members, including a
set of gas pervious foraminous faces arranged in parallel,
an upstream gas inlet and a downstream gas outlet de?n
spaced relationship downstream and intermediate the side
ing a path for a gas ?ow stream to be treated, a plurality
?ank of said ?rst set of support members, a ?rst set of
of endless ?lter belts disposed within said housing between
endless ?lter belts arranged to move in spaced upstream
said gas inlet and gas outlet, said ?lter belts extending
and downstream ?ight paths across a gas ?ow stream so
transverse said gas flow stream and being arranged to
that successive portions of each of said ?lter belts enter
move in spaced upstream and downstream ?ight paths
said gas ?ow stream at an entrance point, pass across it
thereacross so that successive portions of each of said ?lter
over a gas pervious foraminous face of said ?rst set of
?lter media support members and then leave it at an exit
port members extending adjacent said upstream ?ight 35 point, a second set of endless ?lter belts arranged to move
belts enter said gas ?ow stream at an entrance point, pass
across it and then leave it at an exit point, spaced sup
in spaced upstream and downstream ?ight paths across
paths of said endless belts, said endless belts being posi
such gas ?ow stream so that successive portions of each
of said ?lter belts of said second set enter said gas flow
stream at an entrance point downstream of the entrance
each of said support members including a foraminous up
stream face and spaced guide rail members extending 40 point of said ?rst set, pass across it over a gas pervious
foraminous face of said second set of ?lter media support
along the sides of said upstream face, and means for mov
members and then leave it at an exit point, said ?lter belts
ing said ?lter belts over said foraminous faces of said
being positioned with respect to each other to present a
support members between said guide rails into and out of
pleat type construction along said upstream ?ight paths,
such gas ?ow stream.
16. Gas cleaner apparatus comprising a housing having 45 and means for moving said belts into and out of such gas
flow stream.
an upstream gas inlet and a downstream gas outlet de?n
19. The apparatus of claim 18, said moving means in
ing a path for a gas ?ow stream to be treated, a plurality
tioned with respect to each other in said housing to present
a pleat type construction along said upstream ?ight paths,
cluding closely spaced roll pairs, one of said rolls of said
of endless ?lter belts disposed within said housing be
pair being hollow with the wall thereof having a plurality
tween said gas inlet and said gas outlet, said ?lter belts
extending transverse said gas ?ow stream and being ar 50 of spaced, longitudinally disposed apertures, said hollow
ranged to move in spaced upstream and downstream ?ight
feeddroll being connected to a suitable source of treating
liqui .
paths thereacross so that successive portions of each of
said belts enter said gas ?ow stream at an entrance point,
References Cited in the ?le of this patent
pass across it and then leave it at an exit point, succes
sive ?lter belts being offset with respect to one another 55
UNITED STATES PATENTS
along the line of ?ow of the gas ?ow stream and having
1,814,855
Robbins et a1 __________ __ July 14, 1931
overlapping side portions transverse such line of ?ow to
present a pleat tye construction along said upstream ?ight
paths, successively offset, spaced upstream and down
stream support members including foraminous faces co
operating with the upstream ?ights of said endless ?lter
60
2,144,451
2,271,401
2,792,907
2,869,680
Dollinger _____________ __ Jan.
Sainty _______________ __- Jan.
Replogle _____________ __. May
Fields ________________ __.. Jan.
17,
27,
21,
20,
1939
1942
1957
1959
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